<template>
  <div id="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <TodoHeader @addTodo="addTodo" />
        <List
          :todos="todos"
          :toggleDone="toggleDone"
          :deleteTodo="deleteTodo"
        />
        <TodoFooter
          :todos="todos"
          @toggleDoneAll="toggleDoneAll"
          @clearAllDone="clearAllDone"
        />
      </div>
    </div>
  </div>
</template>

<script>
import TodoHeader from "./components/TodoHeader.vue";
import List from "./components/List.vue";
import TodoFooter from "./components/TodoFooter.vue";

export default {
  name: "App",
  data() {
    return {
      todos: JSON.parse(localStorage.getItem("todos")) || [],
    };
  },
  components: {
    TodoHeader,
    List,
    TodoFooter,
  },
  methods: {
    // 添加一个todo项
    addTodo(item) {
      this.todos.unshift(item);
    },
    // 切换
    toggleDone(id) {
      this.todos.forEach((todo) => {
        if (todo.id === id) todo.done = !todo.done;
      });
    },
    // 删除
    deleteTodo(id) {
      this.todos = this.todos.filter((item) => item.id !== id);
    },
    // 全选 or 取消全选
    toggleDoneAll(value) {
      this.todos.forEach((item) => (item.done = value));
    },
    // 清除所有完成的todo项
    clearAllDone() {
      this.todos = this.todos.filter((item) => !item.done);
    },
  },
  watch: {
    todos: {
      deep: true,
      handler(value) {
        localStorage.setItem("todos", JSON.stringify(value));
      },
    },
  },
};
</script>

<style>
body {
  background: #fff;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}

.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}
</style>
